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elevation cap in the usa but ?

Discussion in 'Inspire 1 Discussion' started by Redtazdog, Oct 22, 2015.

  1. Redtazdog

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    Is it legal to launch from a 4000 ft mountain top and fly out a mile or so where you would be well above
    the elevation cap and into air space for planes.
    I don't think so do you ?
     
  2. msinger

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    The FAA's rules say you may not fly above 400 feet AGL (above ground level). So, no, you are not allowed to do that.
     
  3. Redtazdog

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    That's what I thought.
    It would be nice if DJI would fix the max cap elevation of 4 -500 ft so the birds max elevation would be from the RC not where the take off point was then in follow mode we can climb a mountain higher than the max and it would still be from GL
     
    Chnjab likes this.
  4. The Editor

    The Editor Moderator
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    The only problem with this is how would DJI implement it?

    The Inspire (and other multirotor craft) only know their relative height from take off due to a barometric sensor which has to start at zero upon aircraft boot up (otherwise you would have to manually dial in your elevation above sea level each time) and then sense the change in pressure to calculate the aircrafts height from take off.
    You cannot reliably use GPS for altitude measurement as there are technical problems with this and on a bad day altitude data derived from GPS only can be up to +/- 400 feet out :eek:.

    In order for terrain following (at height) you would need to load a database (albeit local) of the topology in that area and then cross reference it in real time against your three dimensional fix using GPS/Glonass. Unfortunately the Inspire neither has the memory or processing power to do that.

    I am sure a solution will come but it will not be in the lifetime of the Inspire 1.
     
  5. Kilrah

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    Yes easy to access on a computer or mobile device, but a whole other level of involvement to store it and have it processed onboard the aircraft like would be needed.
     
  6. SultanGris

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    impossible,the inspire doesnt know what height its at, the displayed altitude is loosely based on the difference from current position vs where it took off from, it has no idea of actual altitude above sea level or altitude of the terrain at its current position. Change altitude a few times during flight and youll notice the displayed altitude is different even when the inspire is in the same spot. you dont have to "set" anything, you can fly wherever you want at whatever altitude you want up to 1640feet from the take off position unless youre using beginner mode where you can set max height, if thats the case I suggest you switch to normal mode and use common sense, then you dont have to worry about setting anything if you fly around mountains/valleys with terrain height changing drastically. If youre in the middle of nowhere and not interfering with any other aircraft the 400ft rule is basically a guideline and no one is gonna care or report you if youre flying from a mountain/valley situation and exceed that limit even if youre not in the middle of nowhere unless you fly close to manned aircraft perhaps, if anyone even sees you which is unlikely.